#include<cstdio>
#include<iostream>
#include<cstring>
#include<cmath>
#include<stdlib.h>
#include<algorithm>
using namespace std;
double num(double x,double y)
{
    return 6*pow(x,7.0)+8*pow(x,6.0)+7*pow(x,3.0)+5*pow(x,2.0)-y*x;
}
double fun(double x,double y)
{
    return 42*pow(x,6.0)+48*pow(x,5.0)+21*pow(x,2.0)+10*x-y;
}
int main()
{
    int T;
    double Y;
    scanf("%d",&T);
    while(T--)
    {
        scanf("%lf",&Y);
        if(fun(0.0,Y)>=0) printf("%.4lf\n",num(0.0,Y));
        else if(fun(100.0,Y)<=0) printf("%.4lf\n",num(100.0,Y));
        else
        {
            double l=0.0,mid=50.0,r=100.0;
            double ans1,ans2,ans3;
            ans1=fun(l,Y);
            ans2=fun(mid,Y);
            ans3=fun(r,Y);
            while(fabs(ans1-ans2)>0.000001)
            {
                if(ans2>0)
                {
                    ans3=ans2;
                    r=mid;
                    mid=(l+r)/2;
                    ans2=fun(mid,Y);
                }
                else
                {
                    ans1=ans2;
                    l=mid;
                    mid=(l+r)/2;
                    ans2=fun(mid,Y);
                }
            }
            printf("%.4lf\n",num(mid,Y));
        }
    }
}